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1、International Standard 318913 0 1 4 a! INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEXAYHAPOAtiAfl OPrAHMJAL,MR OCTAH,lAPTH3Al. b) removal of defective metal by chipping or grinding; 1) At present at the stage of draft. 1 -,-,- IS0 3189/3-1985 (El c) verification of this removal by radiography, u
2、ltrasonics, magnetic flaw detection or dye penetrants; d) pre-heating the casting to requisite pre-heat temperature immediately prior to welding; e) filling the excavation with weld metal, the composition of the rod being chosen to give mechanical properties matching those of the casting; f) grindin
3、g the surface of the weld metal to the level of the adjacent metal of the socket; g) correct reheat treatment of each repaired socket body; h) verification of crack removal by radiographic or ultra- sonic examination. The pin holes shall be machined in one operation and the centreline of the holes s
4、hall be at right angles to the centreline of the socket basket. 5.2 Pins The pins shall be forged, forged and machined, or machined from the bar, and may be threaded or plain, according to the purchaser s requirements. The steel used shall comply with the requirements specified in IS0 316912. The le
5、ngth of the plain portion of a threaded type pin shall be such that the nut will tighten against the shoulder of the pin and not against the outside face of the socket. The threads on pins and associated nuts shall comply with the coarse pitch series, specified in IS0 261, and tolerance class 6g, sp
6、ecified in IS0 965. A suitable safety device, such as a split cotter pin, shall be pro- vided to prevent nuts accidentally becoming displaced. 6 Special quality control requirements for cast sockets In addition to the general quality control requirements specified in IS0 3169/l, the following tests
7、shall apply. 6.1 Magnetic flaw or dye penetrant method Each socket shall be subjected to an approved method of par- ticle crack detection. All external and internal surfaces shall be examined, and cracks, hot tears, rips or other detrimental defects shall not be accepted. Acceptable levels of defect
8、 should be agreed between the purchaser and the manufacturer. Guidance on acceptable levels is given in IS0 4966. 6.2 Radiographic tests Radiographic tests shall be carried out. The number of samples shall be in accordance with the following table. Lot or batch size (Number of sockets) Sample size (
9、Number of sockets) n 2to 8 L 9to 15 3 16 to 25 5 26 to 50 8 51to 90 13 91 to 150 20 151 to 280 32 281 to 500 60 501 to 1200 80 1 201 to 3 200 125 3 201 to 10 000 200 L 1 Acceptable levels of defect should be agreed between the purl chaser and the manufacturer. Guidance on acceptable levels is given
10、in the annex. 6.3 Ultrasonic tests As an alternative to the radiographic test, the sockets shall be subjected to ultrasonic tests. In such cases, the test method and the acceptable levels of defect shall be the subject of agree- ment between the purchaser and the manufacturer. 2 -,-,- IS0 3189/3-198
11、5 (E) Annex Radiographic tests - Examples of acceptable levels of defect A.1 Acceptable levels of defect for sections up to and including 51 mm Socket fork and junction - Severity level 1 for cracks and tears Severity level 2 for other defects Socket basket - Severity level 1 for cracks and tears Se
12、verity level 3 for other defects A.2 Acceptable levels of defect for sections over 51 mm up to and including 114 mm ) Acceptable level Category Description Level Section A Gas porosity Al Fork and junction A Gas porosity A2 Basket B Sand and slag inclusion Bl Fork and junction B Sand and slag inclus
13、ion 82 Basket C Type 1 shrinkage Cl 1 Fork and junction C Type 1 shrinkage Cl 2 Basket C Type 2 shrinkage c2 1 Fork and junction C Type 2 shrinkage c2 2 Basket C Type 3 shrinkage c3 1 Fork and junction C Type 3 shrinkage c3 2 Basket D Cracks Not permissible Fork and junction D Cracks cc2 Basket E I Hot tear I - Fork and junction E Hot tear EA 2 Basket F I Inserts I - Fork and junction F inserts EB 1 Basket I) In accordance with ASTM E 186-75, Standard reference radiographs for heavy-walled 12 to 4112 in 151 to 114 mm) steel castings. 3 -,-,-